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4. Conclusions
Three unsymmetrical isomeric diarylethenes bearing a methoxy
group at the para-, meta-, and ortho-position of the terminal
benzene ring were synthesized, and their photochemical and
electrochemical properties were discussed systematically. The
results showed that the electron-donating methoxy group at
different positions of the terminal benzene ring had a significant
effect on the optical and electrochemical properties of these dia-
rylethene derivatives. The electron-donating methoxy group
induced new characteristics which differed from those of diary-
lethene derivatives bearing chlorine atoms which have been
reported previously. The results will be helpful in understanding
the influence of the position of substituents in diarylethenes and
for the synthesis of efficient photoactive diarylethene derivatives
with tunable properties.
Acknowledgements
[31] Pu SZ, Yang TS, Xu JK, Chen B. Substituent position effect on the optoelectronic
properties of photochromic diarylethenes. Tetrahedron Lett 2006;47:3167–71.
[32] Fan CB, Pu SZ, Liu G, Yang TS. Substituent position effect on the properties of
isomeric photochromic diarylethenes bearing chlorine atoms. J Photochem
Photobiol A 2008;194:333–43.
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new unsymmetrical isomeric diarylethenes having a chlorine atom. J Photo-
chem Photobiol A 2008;197:415–25.
This work was supported by Program for New Century Excellent
Talents in University (NCET-08-0702), the Project of Jiangxi Youth
Scientist, National Natural Science Foundation of Jiangxi Province
(2008GZH0020), the Key Scientific Project from Education Ministry
of China (208069) and the Science Funds of the Education Office of
Jiangxi, China (GJJ08365).
[34] Pu SZ, Yan LS, Wen ZD, Liu G, Shen L. Synthesis and chlorine atom position
effect on the properties of unsymmetrical photochromic diarylethenes.
Photochem Photobiol A 2008;196:84–93.
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